//(IDisplayOne) Activator.CreateInstance(Type.GetType(ConfigurationManager.AppSetting["DisplayOneInstance"], true));

        public StudentRetriveController(IDisplayAll displayAll, IDisplayOne displayOne)
        {
            this.displayAll = displayAll;
            this.displayOne = displayOne;
        }
 public StudentOptions(IDisplayAll displayAll, IDisplayOne displayOne)
 {
     _displayAll = displayAll;
     _displayOne = displayOne;
 }